Custom apps · Integrations and API
Integrations and API development.
Every business runs on a handful of systems that were never designed to talk to each other, so people become the integration: copying a booking into the calendar, a lead into the CRM, an order into accounting. We build the connections that remove that work, using each system's official API, with logging and alerts so nothing is silently dropped. Working remotely from our Providence, RI studio, we scope, build, and monitor integrations for businesses across North America.
Quick answer
Integration work connects your website to the CRM, scheduler, accounting, and inventory systems you already use, through their official APIs, with retries, logging, and alerts so nothing is silently dropped. GEO Marketing Group builds custom integrations and APIs starting around $8,000, typically $14,000, working remotely from Providence, RI.
What it does
Integrations and API, in plain language.
Integration work connects your website to the software your business already runs on, so a form submission, booking, or order flows into your CRM, scheduler, accounting system, or inventory without anyone re-typing it. Where a system has no connector, we build one against its API. Where your own data needs to be reachable by partners or apps, we build and document the API.
Starting at
from $8,000
A planning anchor, not a quote. Most integrations and API projects land near$14,000, and the scope of roles, integrations, and automation sets the final fixed number.
What integrations and API builds include
Two-way sync with CRMs, schedulers, accounting, inventory, and marketing tools through their official APIs
Webhook handlers that react to events in real time, with retries and a dead-letter log
A private or partner-facing REST API with authentication, rate limits, and documentation
Scheduled jobs for imports, exports, and reconciliation against the source of truth
Field mapping and validation rules you can review, with an audit trail of every record moved
Monitoring and alerts when a connection fails, so silent data gaps do not accumulate
How we build it
The stack behind integrations and API builds.
Integration work is typically a Node service with typed API clients, a Postgres table for sync state and audit logs, a queue for retries, webhook endpoints with signature verification, and OpenAPI documentation when we expose an API, deployed on managed hosting with health checks and alerting.
See the pattern in action
- →Website grader: a form that calls a server-side endpoint and the PageSpeed Insights API
- →Flowstack concept demo: an integration-centered SaaS product site
- →Website cost estimator: structured answers handed off into a prefilled quote form
Portfolio pieces are concept designs for illustrative businesses, not real clients. Tools are live and free to use.
By industry
Integrations and API builds for your kind of business.
The same app type looks different for a clinic than for a contractor. Pick your industry for a guide written around that workflow and the tools it already runs on.
Other app types
FAQ
Integrations and API builds: common questions.
Can you connect my website to the software I already use?
Is Zapier enough, or do I need custom integration?
What happens when an integration breaks?
Ready to scope your integrations and API build?
Describe the workflow in plain language: who uses it, what they need to see, and what should happen automatically. We come back with a scope, a realistic timeline, and a fixed quote.